Define co-efficient of viscosity. Write its dimension. How the viscosity of liquid and gas vary with temperature?
PLEASE ANSWER BRIEFLY OF CLASS 11 PHYSICS
Answers
Answer:
Informally, viscosity is the quantity that describes a fluid's resistance to flow. Fluids resist the relative motion of immersed objects through them as well as to the motion of layers with differing velocities within them.
Formally, viscosity (represented by the symbol η "eta") is the ratio of the shearing stress (F/A) to the velocity gradient (∆vx/∆z or dvx/dz) in a fluid.
The SI unit of viscosity is the pascal second [Pa s], which has no special name
The coefficient of viscosity of fluids will be decreased as the temperature increases, while it is inverse in the case of gases. While the coefficient of viscosity of gases will increase with the increase in temperature. The increase in temperature for the fluid deliberate the bonds between molecules. These bonds are directly associated with the viscosity and finally, the coefficient is decreased.